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Industry’s Fastest, Most Accurate All-in-One Viscometer/Densitometer

PAC’s OptiMVD delivers precise, reliable density and viscosity measurement in a single test run, using only 5 mL of sample

HOUSTON, TX. (January 20, 2022) – PAC LP, a global leader in advanced instrumentation for laboratory and process applications for the oil & gas industry, announces the release of OptiMVD, a unique, compact, benchtop solution that measures viscosity and density very fast, without compromising precision and accuracy.

For viscosity, OptiMVD complies with ASTM D7945, a method to measure the dynamic viscosity of a liquid using PAC’s patented, field-proven technology. The instrument incorporates a capillary tube enclosed horizontally in a thermal block, which is maintained at a constant temperature by thermoelectric coolers. The test specimen is pushed across the capillary tube by a constant, regulated pressure of compressed air. As the test sample flows past an array of optical detectors, the transit time is measured. Dynamic viscosity is converted to kinematic viscosity using the density of the liquid, measured by the internal digital density meter, which complies with ASTM D7777. By design, the instrument provides exceptionally accurate determination of viscosity and density in petroleum products between +15°C and +100°C through very tight temperature control.

Each of the three customizable model configurations loads samples, performs viscosity and density measurement, and cleans the system automatically. All configurations measure samples with a viscosity range from 1 mm²/sec to 2,000 mm²/sec at 40°C. In a dual-module configuration, OptiMVD measures viscosity at two unique temperatures in a single test run in as little as 10 minutes, and reports Viscosity Index (VI) in addition to viscosity and density results using a sample from the same vial. Additionally, the dual configuration allows programming of up to 48 samples at a time.

In addition to being small, rapid, and highly accurate, OptiMVD is also easy to use. Operating the instrument only requires the simple effort of loading the sample into the heated sample injection port or heated carousels. The 13.3” color touchscreen interface requires just a few interactions to program a test and start a run. Calibration and instrument updates can be done quickly, and data download is a quick and simple process through the USB ports. With a real cycle time of as little as 10 minutes, OptiMVD is the fastest viscometer/densitometer available today, with precision that is unmatched by other comparable instruments in its class.

Every aspect of this product is designed around the end user’s convenience and job to do. With its innovative Smart Sample Order feature, OptiMVD evaluates the number of samples, the sample order, the testing temperatures, and any user-defined priority selections to determine the most efficient testing order. The built-in intelligence of Smart Sample Order reduces total testing time by as much as 50% for full carousels running programs of multiple temperatures.

The OptiMVD is a fully self-contained system. It requires no additional investment in external cooling or heating baths. It also has low consumable requirements and is designed for low energy use to support environmental sustainability efforts, which, when combined with the fast cycle time and low cleaning solvent usage, translate into a low total cost of ownership.

“We listened to our customers and watched how they work, and then developed a viscometer/density meter instrument that delivers high precision and fast analysis times. It is also easy to use, has low cost of ownership and high uptimes, and is packed with labor-saving features in a package that minimizes the use of benchtop real estate,” said Dr. Larry Spino, Group Product Manager at PAC. “The OptiMVD is designed from the ground up with the end user in mind. It is inherently flexible to meet the needs of laboratories with unique requirements. For example, users can test samples from the same vial at two different temperatures, and they can test samples from either carousel in any order. This ensures a high level of operational efficiency. Combine that with the low total cost of ownership, and the OptiMVD is really unmatched in the industry.”

Designed for the challenges of an industrial lab environment, OptiMVD offers speed, precision, and low cost of ownership. By employing digital automation technologies, it increases test productivity and improves repeatability and reproducibility.

For more information about PAC’s OptiMVD, visit

Process Solutions by PAC

By leveraging the strengths of key complementary brands, PAC refocuses resources to improve operational efficiencies, invest in R&D, and better support customers in the process segment.

PAC - Petroleum Analyzer Company, a leading global manufacturer of advanced analytical instruments for laboratories and online process applications, announces the formation of Process Solutions, a new business unit within PAC developed to optimize internal operations, leverage technical expertise across functional divisions, and invest in solutions targeting critical markets.

Process Solutions includes the trusted brands of Advanced Sensors, Cambridge Viscosity, Antek’s NSure product line, and ISL’s MicroDist and ViscoSure product lines. Together, these brands offer a wide range of online instrumentation, including oil-in-water analysis, viscometry, elemental analysis, and distillation analysis. All designed to deliver reliable, real-time results that support process optimization, these products provide unbeatable uptime and maximize yield for end users. Across the board, PAC’s brands of instrumentation and analyzers are designed to optimize equipment performance, reduce lifecycle costs, improve throughput, and maximize profitability for our end users.

“We’ve seen a significant amount of change over the past six months,” said Patrick Riley, Vice President, Process Solutions. Riley, who had previously been Director of Sales for the Process Analytics group, now has direct responsibility for Process Solutions. Riley continued, “This change has been exceedingly positive. Where before we had operated as independent silos, each segment now operates as a team, with cross-divisional responsibilities, allowing us to provide our customers with a wider range of products, solutions, and expertise to grow their businesses. Integrating our portfolio and our Sales, Inside Sales, Applications, Marketing, Engineering, and Service teams has allowed us to deliver higher value to our partners.”

For more information on Process Solutions, visit the website at


This year we are celebrating two major milestones:
AC Analytical Controls' 40th and Herzog's 90th anniversaries

AC 40 years - Herzog 90 years

In 1931, Mr. Walter Herzog founded Walter Herzog Gmbh in Berlin; and in 1981 Mr. Han Spaans started AC Analytical Controls, in Rotterdam. Herzog and AC have been the industry's preferred brands for distillation, flash point and gas chromatography respectively. Today, we are proud to celebrate important milestones for these two iconic brands. Cheers to many more decades being pioneers in advanced analytical solutions! #AC40years #herzog90years

25 years of being ISO 9001-certified

Our Rotterdam facility proudly celebrated 25 years of being ISO 9001-certified. Since 1995, AC Analytical Controls B.V. (acquired by PAC on 2006) has worked under an ISO 9001 Certified Quality Management System which helps with the development, production and support of analytical solutions in Gas Chromatography and Elemental Analysis.

ISO Certification

Pittcon 2020

It was great to see some of our valued customers and channel partners at Pittcon.

Pittcon Pittcon


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